Resembling or containing characteristics of an arch; of, relating to, or composed of feldspar-rich sedimentary rock.
From Latin 'arcus' (arch) + '-ose' (full of, characterized by); in geology, describes sedimentary rocks that show arkose composition with granular, arch-forming mineral structures.
Geologists use 'arcose' to describe sandstones rich in feldspar crystals that have that slightly arched, granular appearance—it's how they classify rocks by their mineral composition at a glance.
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